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fs: fix WTF-8 decoding issue (#4092)

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We forgot to mask off the high bits from the first byte, so we ended up
always failing the subsequent range check.

Refs: #2970
Fixes: https://github.com/nodejs/node/issues/48673
This commit is contained in:
Jameson Nash 2023-07-13 12:22:07 -04:00 committed by GitHub
parent 50b53cbd0d
commit d09441ca03
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1 changed files with 3 additions and 1 deletions
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src/win/fs.c
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@ -176,9 +176,11 @@ static int32_t fs__decode_wtf8_char(const char** input) {
if ((b4 & 0xC0) != 0x80)
return -1; /* invalid: not a continuation byte */
code_point = (code_point << 6) | (b4 & 0x3F);
if (b1 <= 0xF4)
if (b1 <= 0xF4) {
code_point &= 0x1FFFFF;
if (code_point <= 0x10FFFF)
return code_point; /* four-byte character */
}
/* code point too large */
return -1;